Florida, the law requires that all riders younger than 21 years wear helmets, without exception. Those 21+ may ride without helmets only if they can show proof that they are covered by a medical insurance policy.
Yeah but it's not enforced. You see TONS & TONS of people without helmets, never
ever heard of someone getting ticketed or stopped and checked.
Heck most of 'em don't even know the law, just figure helmets not required.